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Somewhere in my many JT videos I ask, and answer, the question "what happens after the light goes out". That is, when the supply voltage is no longer high enough for the JT to light up the LED(s). The particular JT I used continued to produce an oscillation just like what you show at the end of your video-- a low voltage sinus oscillation that went on for a long time apparently without losing amplitude until it finally stopped. Without the LED being on to drain the power I guess it was in a "high Q" oscillating mode. Which of course doesn't actually explain anything, just gives it a name (which may not be correct.)

I think it was this JT but I can't find the right video showing the "dark oscs" at the moment.

I however never got this prolonged oscillation after disconnecting the base that Graham had with his setup.Not even when using a wire through the toroid connected to copper tape around the HV radiant transformer (see 3th video).

Thanks for that redraw Itsu, you saved me the trouble. Now the resemblance to some Joule Thief circuits is easier to see.

A question about the "HV Radiant" transformer though... it appears you have labelled it as a step-down transformer, with the lower voltage winding on the HV output side. Is this correct? I can't quite wrap my mind around that.

On the original schematic it looks to me like the transformer is wired as step-UP , which makes more sense to me.

Also, does the "HV Radiant" share a common ground with the Negative rail of the power supply? Or is the Negative rail "floating" and the HV Radiant grounded to Earth?

The 3n247 seems like an odd choice for a bridge rectifier that is supposed to be used in an "HV radiant" output circuit. Comments?

The closest fast diodes to the MUR440 that I have on hand are UF3003. Instead of 400V, 4 A these are rated 300V, 3A. If my local supplier doesn't have the MUR440 in stock for a reasonable price (1.00 USD or less, checking tomorrow) I'll have to use the UF3003s when I get around to constructing the circuit. Or I may go "overkill" and use MUR1560 which I know he does stock for about a dollar each. Comments?

And I intend to use a small CRT yoke ferrite for the "toroid". Comments?

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there was confusion about the direction of that transformer from the start, i expected too that it would be connected to the collector via the secondary (24V) to get a HV (radiant) signal from the primary (240V), but Graham just asked Nelson the other day in this thread:

When you get something slapped together Tinsel, see if you can replicate then explain this...

You apply a few volts and you will see a typical oscillator, nothing special, drawing a few milliamps as would be expected.

If you slowly increase PSU voltage, you will get to a point (between 7v & 9v) where the circuit behaves much different. Milliamp draw will go to practically zero; the waveform will go berserk quite literally, voltages on the scope will exceed 10x probe settings or nearly so.

I built this goofy thing about a year ago and still don't comprehend what it is doing or how. It certainly didn't appear to me to be normal. Maybe it is. Hopefully you can get similar results and clue us in.

Whatever Nelson was on to, he chased something most of us wouldn't think to follow.

One other little note: Pay particular attention to how the circuit operates when it first goes into "berserk mode", because after just tens of seconds, you will never see this again quite the same. I think the voltages actually damage the electrolytic capacitors. However, you cannot substitute these electrolytic capacitors with something of higher voltage rating. The way they are designed as rolled flat plates is essential to the operation of this circuit, as though their real purpose is some sort of coil instead of capacitor. Probably why Nelson has been doing extensive research with pancake coils--he knows what he is looking for now.

What you've described reminded me of a video I made some time ago with a very simple circuit from TinMan, using a Tesla Bifilar pancake coil.I posted a link to it when I first made it and I'm kind of reluctant to post it again, what with the flame wars and all, and I don't want totake this thread off-track.

In your build did you have the transformer and the FWBs installed when you saw the weirdness, or just what you have on the breadboard?